Here are services you can use to check what network a cellphone number is on in South Africa.
I don’t offer this service. It is up to you to use the following tools to find the info for yourself.
- https://messente.com/carrier-lookup – looks like it gives the original carrier a number was registered on
- https://www.porting.co.za/PublicWebsite/ – gives the current carrier
- https://freetools.textmagic.com/carrier-lookup – limited info